Direct-current circuit breaker handcart

Abstract

The utility model discloses a direct current circuit breaker handcart. The direct-current circuit breaker handcart comprises a chassis truck, a handcart shell, a main branch assembly, a transfer branch assembly and an energy consumption branch assembly, wherein the handcart shell is arranged on the chassis vehicle; a supporting channel steel is arranged in the front side of the handcart shell; the main branch assembly, the transfer branch assembly and the energy consumption branch assembly are arranged on the supporting channel steel. Therefore, the handcart comprises the main branch circuit assembly, the transfer branch circuit assembly, the energy consumption branch circuit, the chassis truck and the handcart shell, and the main branch circuit assembly, the transfer branch circuit assembly and the energy consumption branch circuit are simultaneously fused on the handcart, so that on one hand, a direct-current circuit breaker can be thoroughly cut off in a system and a visible fracture is formed; and the stability of the power system and the safety of maintainers are improved. On the other hand, compartments or other cabinets do not need to be added, the high integration degree of the product structure is improved, the product structure is simplified, the occupied area is reduced, the manufacturing cost is reduced, the applicability is improved, and product popularization is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a DC circuit breaker trolley. Background Art

[0002] Flexible DC power distribution is one of the important ways to achieve the "dual carbon" goal. The 10kV DC circuit breaker used in the flexible DC power distribution network is the key equipment for building a DC distribution network, which is the basic guarantee for the safe operation of the system. At present, there are three main types of DC circuit breaker technical solutions that meet the needs of DC power grids, namely traditional mechanical DC circuit breakers based on conventional switches, solid-state DC circuit breakers based on pure power electronic devices, and hybrid DC circuit breakers based on a combination of the two. Among them, solid-state and hybrid circuit breakers have the disadvantages of high cost and complex control due to the extensive use of power electronic devices. In comparison, mechanical DC circuit breakers have lower costs and relatively simple control, which is conducive to promotion.

[0003] However, most of the existing DC circuit breakers are hybrid or mechanical solutions. The structure of the hybrid DC circuit breaker is generally a circuit breaker cabinet plus a power electronic cabinet, in which the trolley is used alone as the main branch, and the transfer branch and energy-consuming branch are configured in the power electronic cabinet, resulting in a large footprint and complex product structure. Mechanical DC circuit breakers generally increase the cabinet volume, and install transfer branches or energy-consuming branch devices by setting up other compartments. The trolley fails to integrate the three branches, and the DC circuit breaker fails to be completely disconnected from the system during maintenance and form a visible break, which is not conducive to the safety of maintenance. Utility Model Content

[0004] The utility model provides a DC circuit breaker trolley to improve the stability and maintenance safety of the power system, reduce the floor space, simplify the product structure and reduce the manufacturing cost.

[0005] According to one aspect of the utility model, a DC circuit breaker trolley is provided, the DC circuit breaker trolley comprising: a chassis, a trolley housing, a main branch assembly, a transfer branch assembly and an energy consumption branch assembly;

[0006] Wherein, the trolley shell is arranged on the chassis vehicle; a supporting channel steel is arranged inside the front side of the trolley shell; the main branch assembly, the transfer branch assembly and the energy consumption branch assembly are arranged on the supporting channel steel.

[0007] Optionally, the main branch assembly includes a fast mechanical switch, and the fast mechanical switch is arranged on the supporting channel steel.

[0008] Optionally, the transfer branch assembly includes a first contact arm, a second contact arm, a first moving contact, a second moving contact and a capacitor;

[0009] The fast mechanical switch is provided with a first port and a second port, the first contact arm and the first moving contact are provided on the first port; the second contact arm and the second moving contact are provided on the second port;

[0010] Wherein, the capacitor device is embedded between the first contact arm and the second contact arm and serves as a transfer branch capacitor device;

[0011] The inductance generated when the current flows through the first contact arm, the second contact arm, the first moving contact and the second moving contact serves as the transfer branch inductance.

[0012] Optionally, the energy-consuming branch circuit assembly includes a resistor; an insulator is provided above one side of the supporting channel steel; the resistor is provided on the insulator and is arranged symmetrically with the fast mechanical switch on the supporting channel steel.

[0013] Optionally, the first end of the resistor component and the first end of the capacitor component are connected on the first contact arm through a first copper busbar, and the second end of the resistor component and the second end of the capacitor component are connected on the second contact arm through a second copper busbar.

[0014] Optionally, the first copper bar and the second copper bar are L-shaped copper bars.

[0015] Optionally, the resistor device is a metal oxide varistor.

[0016] Optionally, lifting holes are respectively provided on both sides of the upper end of the trolley shell.

[0017] Optionally, directional wheels are respectively provided on both sides of the front end of the trolley shell; the bottom of the directional wheels is in the same horizontal plane as the bottom of the wheel of the chassis vehicle.

[0018] Optionally, the DC circuit breaker trolley is a mid-mounted structure.

[0019] The technical solution of the embodiment of the utility model provides a DC circuit breaker trolley, which includes: a chassis, a trolley shell, a main branch assembly, a transfer branch assembly and an energy-consuming branch assembly; wherein the trolley shell is arranged on the chassis; a supporting channel steel is arranged inside the front side of the trolley shell; the main branch assembly, the transfer branch assembly and the energy-consuming branch assembly are arranged on the supporting channel steel. It can be seen that the trolley includes the main branch assembly, the transfer branch assembly, the energy-consuming branch, the chassis and the trolley shell, and the main branch assembly, the transfer branch assembly and the energy-consuming branch are integrated on the trolley at the same time. On the one hand, the DC circuit breaker can be completely disconnected in the system and a visible fracture can be formed, thereby improving the stability of the power system and the safety of maintenance personnel. On the other hand, there is no need to add compartments or other cabinets, which improves the high integration of the product structure, simplifies the structure of the product, reduces the floor space, reduces the manufacturing cost, improves the applicability, and is conducive to the promotion of the product.

[0020] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a front view structural schematic diagram of a DC circuit breaker trolley provided in an embodiment of the utility model;

[0023] Figure 2 It is a side view structural schematic diagram of a DC circuit breaker trolley provided in an embodiment of the utility model;

[0024] Figure 3 It is a topological structure diagram of a DC circuit breaker provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] Figure 1 Schematic diagram of the front view of a DC circuit breaker trolley provided in the embodiment of the utility model. Figure 1 The DC circuit breaker trolley includes: a chassis 10, a trolley shell 11, a main branch assembly 20, a transfer branch assembly 30 and an energy consumption branch assembly 40; wherein the trolley shell 11 is arranged on the chassis 10; a supporting channel steel 14 is arranged inside the front side of the trolley shell 11; the main branch assembly 20, the transfer branch assembly 30 and the energy consumption branch assembly 40 are arranged on the supporting channel steel 14.

[0028] The DC circuit breaker trolley is a mechanical trolley suitable for medium voltage. The DC circuit breaker refers to a switch device that can close, carry and disconnect the DC operating current in the medium voltage DC transmission system, and can close, carry and disconnect the current under abnormal circuit conditions (such as short circuit conditions) within a specified time.

[0029] The chassis 10 is provided with wheels for moving the trolley, so as to facilitate the operator to move the trolley and operate it conveniently.

[0030] Specifically, the DC circuit breaker trolley includes a chassis 10, a trolley housing 11, a main branch assembly 20, a transfer branch assembly 30 and an energy consumption branch assembly 40. A support channel steel 14 is provided inside the front side of the trolley housing 11, and the main branch assembly 20, the transfer branch assembly 30 and the energy consumption branch assembly 40 are arranged on the support channel steel 14, so that the trolley can realize the integration of the main branch, the transfer branch and the energy consumption branch on the same trolley at the same time. Since the main branch, the transfer branch and the energy consumption branch are integrated on the trolley at the same time, the DC circuit breaker can be directly pulled out during maintenance, so that the DC circuit breaker is completely disconnected in the system and a safe and reliable air isolation fracture is formed, which is convenient for maintenance personnel to use and operate, thereby greatly improving the stability of the power system and the safety of maintenance personnel. Compared with the existing technology of adding compartments or other cabinets to disperse the main branches, transfer branches and energy-consuming branches, the product is highly integrated, the product structure is simplified, the footprint is reduced, the manufacturing cost is reduced, which is beneficial to the construction and promotion of medium-voltage flexible direct current systems and improves the applicability of the product.

[0031] In the technical solution of this embodiment, the implementation process of the DC circuit breaker trolley is as follows: Figure 1 When maintenance work is required, since the DC circuit breaker trolley is integrated with the main branch assembly 20, the transfer branch assembly 30 and the energy-consuming branch assembly 40, compared with the prior art, this solution will no longer be restricted by the wiring harness, distance, space, etc. Therefore, when performing maintenance work, the DC circuit breaker can be directly pulled out to completely disconnect the DC circuit breaker in the system and form a safe and reliable air isolation break, which is convenient for maintenance personnel to use and operate, thereby greatly improving the stability of the power system and the safety of maintenance personnel. When the maintenance work is completed, the maintenance personnel can directly push the DC circuit breaker to its original place. In addition, the DC circuit breaker trolley is also provided with a chassis vehicle, and the chassis vehicle is provided with wheels, so as to facilitate the operation of maintenance personnel.

[0032] The technical solution of this embodiment provides a DC circuit breaker trolley, which includes: a chassis, a trolley shell, a main branch assembly, a transfer branch assembly and an energy-consuming branch assembly; wherein the trolley shell is arranged on the chassis; a supporting channel steel is arranged inside the front side of the trolley shell; the main branch assembly, the transfer branch assembly and the energy-consuming branch assembly are arranged on the supporting channel steel. It can be seen that the trolley includes the main branch assembly, the transfer branch assembly, the energy-consuming branch, the chassis and the trolley shell, and the main branch assembly, the transfer branch assembly and the energy-consuming branch are integrated on the trolley at the same time. On the one hand, the DC circuit breaker can be completely disconnected in the system and a visible fracture can be formed, thereby improving the stability of the power system and the safety of maintenance personnel. On the other hand, there is no need to add compartments or other cabinets, which improves the high integration of the product structure, simplifies the product structure, reduces the floor space, reduces the manufacturing cost, improves the applicability, and is conducive to the promotion of the product.

[0033] Figure 2 1 is a side view of a DC circuit breaker trolley provided in an embodiment of the utility model. Figure 1 and Figure 2 The main branch assembly includes a fast mechanical switch 1, which is arranged on a supporting channel steel 14.

[0034] The fast mechanical switch 1 is a mechanical switch that can be opened and closed within a few milliseconds and can withstand the transient breaking voltage of a high-voltage DC circuit breaker.

[0035] Among them, the main branch is composed of a fast mechanical switch 1.

[0036] Optionally, continue combining Figure 1 and Figure 2 The transfer branch assembly includes a first contact arm 7, a second contact arm 3, a first moving contact 6, a second moving contact 4 and a capacitor device 2; the fast mechanical switch 1 is provided with a first port D1 and a second port D2, the first contact arm 7 and the first moving contact 6 are provided on the first port D1; the second contact arm 3 and the second moving contact 4 are provided on the second port D2; wherein the capacitor device 2 is embedded between the first contact arm 7 and the second contact arm 3, and serves as a transfer branch capacitor device; wherein the inductance generated when the current flows through the first contact arm 7, the second contact arm 3, the first moving contact 6 and the second moving contact 4 serves as the transfer branch inductance.

[0037] The transfer branch is composed of inductance and capacitance components. The inductance generated by electromagnetic induction when current flows through the first contact arm 7, the second contact arm 3, the first moving contact 6 and the second moving contact 4 is used as the transfer branch inductance. The capacitance component is used as the transfer branch capacitance.

[0038] Its reference Figure 2 The fast mechanical switch 1 is provided with a first port D1 and a second port D2, the first contact arm 7 and the second contact arm 3 are respectively provided on the first port D1 and the second port D2, and the capacitor device 2 is embedded between the first contact arm 7 and the second contact arm 3, thereby, the fast mechanical switch 1 and the capacitor device 2 are connected in parallel.

[0039] Exemplary, reference Figure 2The first contact arm 7 and the first moving contact 6 are arranged on the first port D1, and the first contact arm 7 and the first moving contact 6 are connected. The second contact arm 3 and the second moving contact 4 are arranged on the second port D2, and the second contact arm 3 and the second moving contact 4 are connected. When current flows through the first contact arm 7, the second contact arm 3, the first moving contact 6 and the second moving contact 4, inductance is generated due to electromagnetic induction, and the capacitor device 2 is embedded between the first contact arm 7 and the second contact arm 3. Therefore, the inductance generated when the current flows through the first contact arm 7, the second contact arm 3, the first moving contact 6 and the second moving contact 4 is connected in series with the capacitor device 2.

[0040] Optionally, continue to refer to Figure 1 and Figure 2 The energy consumption branch circuit assembly includes a resistor 9; an insulator 13 is arranged above one side of the supporting channel steel 14; the resistor 9 is arranged on the insulator 13 and is arranged symmetrically with the fast mechanical switch 1 on the supporting channel steel 14.

[0041] The energy consumption branch is composed of a resistor device 9.

[0042] Optionally, refer to Figure 2 The first end of the resistor 9 is connected to the first end of the capacitor 2 via the first copper bus 8 on the first contact arm 7 , and the second end of the resistor 9 is connected to the second end of the capacitor 2 via the second copper bus 5 on the second contact arm 3 .

[0043] Among them, the first end of the resistor device 9 is connected to the first end of the capacitor device 2 through the first copper busbar 8 on the first contact arm 7, and the second end of the resistor device 9 is connected to the second end of the capacitor device 2 through the second copper busbar 5 on the second contact arm 3, thereby, the resistor device 9 is connected in parallel with the capacitor device 2. And because the first contact arm 7 is arranged on the first port D1 of the fast mechanical switch 1, and the second contact arm 3 is arranged on the second port D2 of the fast mechanical switch 1, thereby, the resistor device 9 is connected in parallel with the fast mechanical switch 1.

[0044] Optionally, the first copper bar 8 and the second copper bar 5 are L-shaped copper bars.

[0045] Exemplarily, the L-shaped copper bar can be formed by combining two rectangular copper bars. In addition, the first copper bar 8 and the second copper bar 5 can also be copper bars of other forms. They can be set according to actual conditions and are not specifically limited here.

[0046] Optionally, the resistor device 9 is a metal oxide varistor.

[0047] Among them, Metal Oxide Varistor (MOV) is a resistor device with nonlinear volt-ampere characteristics, which is mainly used to clamp the voltage when the circuit is subjected to overvoltage and absorb excess current to protect sensitive devices.

[0048] Figure 3 This is a topological structure diagram of a DC circuit breaker provided in an embodiment of the utility model. Figure 3 The topological structure diagram includes a main branch, a transfer branch and an energy consumption branch. The main branch includes a fast mechanical switch K, the transfer branch includes an inductor L and a capacitor C, and the energy consumption branch includes an MOV. The inductor L is the inductance generated when the current flows through the first contact arm 7, the second contact arm 3, the first moving contact 6 and the second moving contact 4.

[0049] Optionally, lifting holes 12 are respectively provided on both sides of the upper end of the trolley housing 11 .

[0050] The advantage of arranging the lifting holes 12 on both sides of the upper end of the trolley housing 11 is that it is convenient for maintenance personnel to pull the trolley in and out and keep the trolley balanced during maintenance work.

[0051] Optionally, directional wheels 15 are respectively provided on both sides of the front end of the trolley housing 11 ; the bottom of the directional wheel 15 is in the same horizontal plane as the bottom of the wheel of the chassis 10 .

[0052] The directional wheel 15 is used to control the movement direction of the trolley, thereby improving the stability and accuracy of the trolley movement.

[0053] Optionally, the DC circuit breaker trolley is a mid-mounted structure.

[0054] Among them, the trolley adopts a mid-mounted structure, which can improve the steering characteristics of the trolley on the one hand, and improve the flexibility of the trolley's pulling and pulling on the other hand.

[0055] In the technical solution of this embodiment, the implementation process of the DC circuit breaker trolley is as follows: Figures 1 to 3When maintenance work is required, since the DC circuit breaker trolley is integrated with the main branch assembly 20, the transfer branch assembly 30 and the energy consumption branch assembly 40, compared with the prior art, this solution will no longer be restricted by the wiring harness, distance, space, etc. Therefore, when performing maintenance work, the DC circuit breaker can be directly pulled out to completely disconnect the DC circuit breaker in the system and form a safe and reliable air isolation break, which is convenient for maintenance personnel to use and operate, thereby greatly improving the stability of the power system and the safety of maintenance personnel. When the maintenance work is completed, the maintenance personnel can directly push the DC circuit breaker to its original position. And the transfer branch assembly 30 includes a first contact arm 7, a second contact arm 3, a first moving contact 6, a second moving contact 4 and a capacitor 2, and the inductance of the transfer branch is the inductance generated when the current flows through the first contact arm 7, the second contact arm 3, the first moving contact 6 and the second moving contact 4. Therefore, compared with the prior art, this solution, through reasonable and ingenious design, realizes the integration of the main branch, transfer branch and energy consumption branch on the trolley, and also uses the inductance generated when the current flows through the first contact arm 7, the second contact arm 3, the first moving contact 6 and the second moving contact 4 to replace the normal inductance. On the one hand, it is conducive to further realizing the complete disconnection of the DC circuit breaker in the system and forming a visible break, improving the stability of the power system and the safety of maintenance personnel. On the other hand, there is no need to add compartments or other cabinets, which improves the high integration of the product structure, simplifies the product structure, reduces the floor space, reduces the manufacturing cost, improves the applicability, and is conducive to the promotion of the product.

[0056] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0057] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A DC circuit breaker trolley, characterized in that: include: Chassis vehicle, trolley housing, main branch assembly, transfer branch assembly and energy consumption branch assembly; Wherein, the trolley shell is arranged on the chassis vehicle; a supporting channel steel is arranged inside the front side of the trolley shell; the main branch assembly, the transfer branch assembly and the energy consumption branch assembly are arranged on the supporting channel steel.

2. The DC circuit breaker trolley according to claim 1, characterized in that: The main branch assembly includes a fast mechanical switch, and the fast mechanical switch is arranged on the supporting channel steel.

3. The DC circuit breaker trolley according to claim 2, characterized in that: The transfer branch assembly includes a first contact arm, a second contact arm, a first moving contact, a second moving contact and a capacitor; The fast mechanical switch is provided with a first port and a second port, the first contact arm and the first moving contact are provided on the first port; the second contact arm and the second moving contact are provided on the second port; Wherein, the capacitor device is embedded between the first contact arm and the second contact arm and serves as a transfer branch capacitor device; The inductance generated when the current flows through the first contact arm, the second contact arm, the first moving contact and the second moving contact serves as the transfer branch inductance.

4. The DC circuit breaker trolley according to claim 3, characterized in that: The energy consumption branch circuit assembly includes a resistor device; an insulator is arranged above one side of the support channel steel; the resistor device is arranged on the insulator and is arranged symmetrically with the fast mechanical switch on the support channel steel.

5. The DC circuit breaker trolley according to claim 4, characterized in that: The first end of the resistor component and the first end of the capacitor component are connected on the first contact arm through a first copper busbar, and the second end of the resistor component and the second end of the capacitor component are connected on the second contact arm through a second copper busbar.

6. The DC circuit breaker trolley according to claim 5, characterized in that: The first copper bar and the second copper bar are L-shaped copper bars.

7. The DC circuit breaker trolley according to claim 4, characterized in that: The resistor device is a metal oxide varistor.

8. The DC circuit breaker trolley according to claim 1, characterized in that: Lifting holes are respectively arranged on both sides of the upper end of the trolley housing.

9. The DC circuit breaker trolley according to claim 1, characterized in that: Steering wheels are respectively arranged on both sides of the front end of the trolley housing; the bottom of the steering wheel is in the same horizontal plane as the bottom of the wheel of the chassis vehicle.

10. The DC circuit breaker trolley according to claim 1, characterized in that: The DC circuit breaker trolley is a mid-mounted structure.

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